Enjoyed the landing page and the product looks very simple and useful. However, I was thrown off by the demo image used (a login page) and was confused where I could sign up for your app. I think it would be useful to show a different image for the first interaction. Additionally, consider letting the first-time visitor upload something of their own, drop a comment, and email it to their friends, coworker, or client…
With regards to the behavioural patterns on initial viewing, I definitely agree and this is something we're planning, just need to get it done :)